I also think any newer, lighter, and faster-charging batteries will come (if they ever materialize) at a premium to recoup R&D expenses.
You think the current batteries aren't already being sold the same way?
At least, in the future, the R&D costs should be getting amortized over a much larger number of expected sales.
I am a technical scuba diver. I am tuned into the market for underwater scooters. What has happened in that market is that scooters used lead acid batteries for years. Then, they started changing over to Li-ion batteries. Now, there are popular scooters that use Dewalt 20V power tool batteries.
And, there are companies making kits and/or doing service to convert older scooters to the newer battery tech. You can change an old lead-acid battery-powered scooter to one with a Li-ion pack. You can use it to drive the original electric motor, or you can even possibly swap in a new motor or just a new electronic motor controller, to make it almost like one of the new modern scooters. And, for some, you can even upgrade them to go from lead-acid or a custom Li-ion to using the Dewalt PTBs.
I would fully expect that in 8 or 10 years, when there is a much bigger market for EVs (including PHEVs, etc. - anything with a big battery pack) that need new batteries, there will be companies out there that can change out your Ramcharger battery pack for one that is newer battery tech retrofitted to work just fine in the Ramcharger. Maybe lighter and smaller. Maybe the same size but with more capacity. And, probably an option to spend more and get the truck's plug-in charging module upgraded to one that will allow faster charging (in combo with your new, upgraded battery pack).
Kind of is what it is, it's out of our hands unfortunately.
EVs are 100% the way of the future, but we are not at the future yet.
My great great grandkids will love their hovercar for sure though.
Why are EVs 100% the way of the future?
Passenger cars are not what I would call dual-purpose vehicles. For them, being an EV probably IS the way of the future. In the future, smaller, lighter batteries, that charge very quickly, will make sense.
But, pickup trucks are genuinely dual-purpose. Sometimes they are just another passenger vehicle. But, sometimes, they are a towing/hauling machine. The power requirements very roughly double, when towing a big, heavy trailer. The weight of the vehicle itself, to be "strong" enough for common towing tasks is also significantly increased over a common passenger car. Right now, OEMs are trying to compensate for that by installing bigger batteries, so they can still have useful range when towing. But, as many have pointed out, that means now you are compromising the non-towing utility by always hauling around all the extra weight of those extra batteries and beefier frame/running gear that you really only need when you're towing.
The energy density of batteries is just not remotely as high as the energy density in diesel fuel.
Just my opinion, but I think the ultimate way of the future will be some percent EV, but also a non-trivial percent of vehicles like (keyword "like", not exactly the same as) the Ramcharger, with an onboard biodiesel (i.e. renewable, sustainable, clean-burning fuel) generator, to handle the requirements of towing/hauling and (bonus) long-distance and off-grid driving.